ADD file via upload

src/main/java/com/example/myapp/controller/ChangePasswordController.java

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+package com.example.myapp.controller;
+
+import com.example.myapp.Main;
+import com.example.myapp.service.UserService;
+import com.example.myapp.util.PasswordUtil;
+import javafx.fxml.FXML;
+import javafx.scene.control.*;
+
+public class ChangePasswordController {
+  @FXML private Label userLabel;
+  @FXML private PasswordField oldPwd;
+  @FXML private PasswordField newPwd;
+  @FXML private PasswordField newPwdConfirm;
+  @FXML private Button changeBtn;
+  @FXML private Button backBtn;
+  @FXML private Button clearBtn;
+  @FXML private Label statusLabel;
+
+  private String email;
+  private final UserService userService = UserService.getInstance();
+
+  public void initUser(String email) {
+    this.email = email;
+    userLabel.setText("修改密码 - " + email);
+    clearFields();
+  }
+
+  @FXML
+  public void onChangePassword() {
+    String oldp = oldPwd.getText();
+    String np = newPwd.getText();
+    String np2 = newPwdConfirm.getText();
+
+    if (oldp.isEmpty() || np.isEmpty() || np2.isEmpty()) {
+      statusLabel.setText("请填写所有密码字段");
+      statusLabel.setStyle("-fx-text-fill: red;");
+      return;
+    }
+
+    if (!userService.checkPassword(email, oldp)) {
+      statusLabel.setText("原密码不正确");
+      statusLabel.setStyle("-fx-text-fill: red;");
+      return;
+    }
+    if (!np.equals(np2)) {
+      statusLabel.setText("两次新密码不一致");
+      statusLabel.setStyle("-fx-text-fill: red;");
+      return;
+    }
+    if (!PasswordUtil.validatePasswordRules(np)) {
+      statusLabel.setText("新密码不符合规则（6-10位，含大小写和数字）");
+      statusLabel.setStyle("-fx-text-fill: red;");
+      return;
+    }
+
+    userService.setPassword(email, PasswordUtil.hash(np));
+    statusLabel.setText("密码修改成功！");
+    statusLabel.setStyle("-fx-text-fill: green;");
+    clearFields();
+  }
+
+  @FXML
+  public void onBack() {
+    try {
+      Main.showDashboard(email);
+    } catch (Exception e) {
+      e.printStackTrace();
+    }
+  }
+
+  @FXML
+  public void onClear() {
+    clearFields();
+    statusLabel.setText("");
+  }
+
+  private void clearFields() {
+    oldPwd.clear();
+    newPwd.clear();
+    newPwdConfirm.clear();
+  }
+}